Question

5 why do plants perform both photosynthesis and cellular respiration? a photosynthesis creates sugar for the plant. cellular respiration creates oxygen for the plant. b photosynthesis creates oxygen for the plant to breathe. cellular respiration creates sugar for the plant to eat. c photosynthesis breaks down food to create energy for the plant, while cellular respiration makes food for the plant. d photosynthesis creates food for the plant. cellular respiration breaks down the food to make energy for the plant.

Explanation:

Photosynthesis uses light energy to convert carbon dioxide and water into glucose (food for the plant) and oxygen. Cellular respiration is the process where the plant breaks down glucose (using oxygen) to release energy (in the form of ATP) that the plant can use for various metabolic activities like growth, repair, and reproduction.

• Option A: Cellular respiration does not create oxygen. It uses oxygen to break down glucose. So, A is wrong.
• Option B: Photosynthesis creates oxygen as a by - product, but it is not for the plant to "breathe" in the sense of using it for energy production in the way animals do. Also, cellular respiration does not create sugar. So, B is wrong.
• Option C: Photosynthesis makes food (sugar), and cellular respiration breaks down food. The description in C is reversed. So, C is wrong.
• Option D: Correctly states that photosynthesis creates food (sugar) and cellular respiration breaks down that food to make energy (ATP) for the plant.

Answer:

D. Photosynthesis creates food for the plant. Cellular respiration breaks down the food to make energy for the plant.